Got a small block in Melbourne and wondering if you can fit a proper granny flat? Two storey granny flat designs solve the small block challenge beautifully.
I’ve watched property owners transform 400m² blocks into properties with comfortable granny flats by building up instead of out. A double storey granny flat gives you the same living space as single-storey options but uses half the ground footprint.
This guide shows you how two storey granny flat designs work on Melbourne blocks, what they cost, and whether building up makes sense for your property.
Why Two Storey Granny Flat Designs Work for Melbourne Blocks
Melbourne’s established suburbs have increasingly small block sizes. What was 800m² in the 1960s is often subdivided into 400-500m² blocks today. Single storey granny flats need significant ground space (60m² building plus setbacks equals roughly 80-100m² of yard consumed).
Two storey granny flat designs cut ground coverage in half. A 60m² two storey granny flat might only occupy 35-40m² of ground space. Consequently, that extra 20-30m² of retained yard makes a massive difference on small blocks. You keep more garden, maintain better separation from your main house, and often meet council setback requirements that would be impossible single storey.
The Math
The math is straightforward. Take a typical 400m² block with a house occupying 150m². You have 250m² left. After setbacks (typically 1m from boundaries), you have maybe 180m² usable yard space. A 60m² single storey granny flat plus setbacks consumes 90-100m² of that, leaving you with minimal outdoor space. However, build that same 60m² as two storey, and you use 50-60m² total, preserving significantly more garden.
Privacy Benefits
Double storey construction also helps with privacy. Upstairs bedrooms separate from ground-level living areas. Your tenants or family members get genuine privacy. You maintain yours too. Therefore, the vertical separation works better than horizontal separation on small blocks where buildings end up close together.
Two storey designs work particularly well in middle-ring Melbourne suburbs where blocks range from 400-600m². Inner suburbs with tiny blocks might struggle with height restrictions and heritage overlays. Outer suburbs with larger blocks don’t need to build up. But that sweet spot of middle suburbs? Two storey makes perfect sense. Learn about backyard granny flats.
Popular Double Storey Granny Flat Layouts
The most popular two storey granny flat configuration puts living areas, kitchen, and one bedroom or bathroom downstairs, with two bedrooms and bathroom upstairs. This creates practical, liveable spaces that work for families, professionals, or retirees.
Ground Floor (30-35m²)
Open-plan living and dining area, kitchen with stone benchtops and quality appliances, powder room or full bathroom, laundry (often European-style in bathroom), entry and stairs. Some designs include a bedroom downstairs for accessibility.
First Floor (25-30m²)
Two bedrooms (one larger main bedroom, one smaller second bedroom or study), full bathroom with floor-to-ceiling tiles, linen storage.
Total living space: 55-65m² across two levels. That’s comparable to comfortable single storey granny flats but occupying half the ground space.
Alternative Layouts
Alternative layouts include three-bedroom configurations (one down, two up), work-from-home designs with dedicated office space, or accessible layouts with bedroom and full facilities downstairs plus additional space upstairs.
The key is making stairs work efficiently. Good two storey granny flat designs position stairs to minimize wasted space. You want stairs that don’t dominate the ground floor but remain safe and compliant with building codes.
Two Storey vs Single Storey: Real Cost Comparison
Two storey construction costs more than single storey, but not as much as most people think.
- Single storey 60m² granny flat: $220,000-$240,000 complete with quality inclusions
- Two storey 60m² granny flat: $240,000-$270,000 complete with equivalent inclusions
The premium is typically 10-15% for double storey versus single storey. Where does the extra cost come from? Structural requirements (stronger ground floor to support upper level), stair construction and finishing, additional bathroom if you want facilities on both levels, engineering for two-storey loads, and slightly longer construction time.
The Real Value
But here’s what people miss: on small blocks, two storey might be your only option for adequate size. Comparing costs between “no granny flat because my block is too small” versus “two storey granny flat for $250,000” makes the decision easy.
The value equation changes on small blocks too. A property with a functional granny flat (even if two storey costs more) adds significant value. The alternative of no granny flat adds zero value. Therefore, that $30,000 extra for two storey construction delivers $80,000-$120,000 in property value increase. Worth it.
Rental Returns
Consider rental returns too. Two storey granny flats with proper layouts rent for the same or more than equivalent-sized single storey options. You’re not penalised in rental income for building up. A well-designed 60m² two storey rents for $480-$550 weekly, identical to single storey equivalents.
Melbourne Council Requirements for Double Storey Granny Flats
Council regulations for two storey granny flats are stricter than single storey, but most Melbourne properties can still build them.
Height Restrictions
Height restrictions typically limit granny flats to 6-7 metres maximum. Most two storey designs come in at 6.5-6.8 metres, fitting comfortably within limits. Some heritage areas or special character zones restrict heights to 5 metres (single storey only) or require additional approvals for two storey.
Setback Requirements
Setback requirements often increase for two storey construction. Where single storey might need 1 metre from side boundaries, two storey might require 1.5-2 metres. This protects neighbours from overlooking and maintains adequate light to adjoining properties.
Overlooking and Privacy
Overlooking and privacy regulations matter more with two storey. Upper floor windows can’t directly overlook neighbouring private open space (backyards, courtyards). Designers solve this with frosted glass in strategic locations, clerestory windows (high windows providing light without views), window placement facing your own yard rather than neighbours, and screening or frosting on upper floor windows near boundaries.
Planning Permits
Some Melbourne councils require planning permits for two storey granny flats even when single storey qualifies for faster CDC approval. This adds 8-16 weeks to approval timelines. The extra time isn’t a deal-breaker, just something to factor into your planning.
The key is working with experienced granny flat builders who understand your specific council’s requirements. What works in Boroondara differs from what works in Monash or Banyule. Local knowledge matters.
Rental Income: Why Two Storey Granny Flats Command Premium Rent
Tenants don’t care whether your granny flat is single or two storey. They care about space, layout, and quality. A well-designed double storey granny flat rents for identical rates to single storey equivalents.
Melbourne Rental Rates for Two Bedroom Granny Flats
Melbourne rental rates for two bedroom granny flat options (whether single or two storey):
- Inner suburbs (0-15km): $520-$650 weekly
- Middle suburbs (15-30km): $450-$550 weekly
- Outer suburbs (30-50km): $380-$480 weekly
Tenant Appeal
Two storey designs often include features tenants value: separated bedroom zones (privacy between bedrooms), study or work-from-home space, better natural light (windows on two levels), and perceived value (feels more like a townhouse than a flat).
Families particularly appreciate two storey layouts. Kids’ bedrooms upstairs, parents’ space downstairs, or vice versa. Furthermore, the vertical separation works better than having all bedrooms on one level, especially for families with teenagers.
Professional couples value work-from-home setups. A two storey layout can include dedicated office space without compromising bedroom size. This appeals to the growing remote work market.
Investment Returns
Investment returns remain strong. A $250,000 two storey granny flat earning $500 weekly generates 10.4% gross annual return. That’s excellent for Melbourne property investment and competitive with single storey returns despite slightly higher construction cost. Learn about maximising rental income.
Space-Saving Solutions with Two Storey Designs
Smart two storey granny flat designs maximize every square metre.
Stair design matters. Straight stairs consume less space than L-shaped configurations. Some designs use space under stairs for storage or laundry areas.
European laundry systems integrate washing machines into bathroom cabinetry, eliminating separate laundry rooms. This saves 2-3m² for living areas.
Open-plan ground floors make 30m² feel much larger. Combining living, dining, and kitchen creates flow and perceived size.
Small decks or courtyards adjacent to ground floor living extend usable space. Even 10-15m² of private outdoor area makes the granny flat feel complete.
Two Bedroom Options in Double Storey Layouts
Two bedroom granny flats remain most popular. Double storey layouts handle them efficiently.
Standard configuration: Bedroom 1 (12-14m²), Bedroom 2 (10-12m²). Main bedroom includes built-in wardrobe. Second bedroom works as bedroom, study, or nursery.
Some layouts put one bedroom downstairs (accessible for elderly) with another upstairs. This works well for multi-generational use.
Three-bedroom configurations are possible in 65-70m² designs but rental market is smaller.
The key is adequate bedroom size. Bedrooms under 9m² feel cramped. Proper layouts provide genuinely liveable bedrooms.
Best Two Storey Granny Flat Builders in Melbourne
Not all granny flat builders handle two storey construction well. Look for specific two storey experience.
Factory-built two storey works by creating both levels in the factory, delivering them separately, then stacking on-site. This maintains quality control while achieving two storey configuration.
Site-built two storey loses timeline advantages. Expect 24-32 weeks versus 14-18 weeks for factory-built.
Key Questions
Key questions: How many two storey granny flats have you completed? Can I visit examples? How do you handle structural engineering? What’s your typical timeline?
Experienced builders have refined solutions. Inexperienced builders figure things out on your project.
Investment Analysis: Two Storey ROI
The investment math works well despite higher construction costs.
- Construction Investment: $250,000 (typical two storey 60m²)
- Potential Annual Rental Income: $500/week × 50 weeks = $25,000
- Estimated Gross Rental Yield: 10% annually
- Property Value Increase: $90,000-$120,000
10-Year Position: $250,000 investment + $250,000 potential rental income – $15,000 maintenance = $485,000, plus property value increase.
Compare this to not building: $0 investment, $0 income, $0 value increase.
Two storey on small blocks makes granny flat construction possible when it wouldn’t be otherwise. Consequently, returns remain strong even with slightly higher costs.
Is Two Storey Right for Your Property?
Two Storey Makes Sense When:
- Your block is too small for adequate single storey construction (typically under 500m²)
- You want to preserve more yard space
- Privacy and overlooking are concerns with single storey layout
- Council setbacks make single storey challenging
Two Storey Might Not Suit When:
- Your block easily accommodates single storey (600m²+)
- You or occupants have mobility challenges requiring single-level living
- Heritage or height restrictions prevent two storey
- Budget constraints make the 10-15% premium difficult
The decision isn’t just about block size. Consider who’ll occupy the space. Elderly parents might struggle with stairs daily. Young families manage stairs easily. Moreover, consider your long-term plans too. Will you sell in 5 years? Will this be a rental property? Different situations favor different approaches.
Most Melbourne property owners on blocks under 500m² find two storey granny flat designs solve their space challenges while delivering strong investment returns and preserving valuable yard space. Therefore, the modest cost premium pays for itself through increased property value and rental income.
Conclusion
Two storey granny flat designs let Melbourne property owners maximize small blocks without compromising space. Double storey construction costs 10-15% more ($240,000-$270,000 versus $220,000-$240,000) but uses half the ground footprint while delivering identical rental income at 10%+ annual yields. Moreover, two storey makes perfect sense for blocks under 500m² where single storey won’t fit properly.
Contact Innovista Group for detailed information about double storey designs and realistic costs for your specific block. Additionally, request your free site assessment to explore your options.
